Dec, 1914.] Insect Galls of Cedar Point. 383 



Fig. 2<S. Quercus macrocarpa affected by the gall-wasp 

 Neuroterus floccosus Bassett. 



Cynips floccosa Bassett, Can. Ent. XIII:111. 



Neuroterus exiguissima Bassett. 



N. exigiiissimus Dalla Torre and Kieffer. 



BeutenmiUler, Bull. Am. Mus. XXVIII :123. 



Leaf gall, single-chambered, evident as a yellow-green bHster 



on upper surface, and especially as a circular, convex, rust-colored 



patch of pubescence on lower surface. 3-4 mm. diameter. 



Common. Huron, late July. 



Fig. 29. Ulmus racemosa affected by the mite Eriophyes ulmi 



Ganiian. 



Phvtoptus ulmi Garman, 12th Rep. Ills. State Ent. 1882. 

 Cook, Ins. Galls Ind. 861. 



Leaf gall on upper surface, showing as a tiny spherical pouch 

 with narrow constricted neck. Green Island, July 20 Uncommon. 



Fig. 30. Ulmus americana affected by the louse Colopha 

 ulmicola Fitch. 



Byrsocrypta ulmicola Fitch, 5th Rep. Nox. Ins. N. Y. 1858:843. 



Thelaxes ulmicola Walsh. 



Pemphigus ulmicola Packard. 



Glyphina ulmicola Thomas. 



Colopha compressa Koch. 



Colopha eragrostis Middleton. 



Patch, Bull. 181 Me. Ag. Exp. Sta. 196. 



Leaf gall on upper surface, of the well-known cock's-comb 

 type, being an elongated pouch or fold, dorsally crested. 10-30 

 mm. long x 5-10 mm. high. Green, soon discoloring. 



Fig. 31. Ulmus americana affected by the louse Schizoneura 

 lanigera Riley. 



Schizoneura americana Rilev in part. 

 Patch, Bulls. 203 and 217 Me. Ag. Exp. Sta. 



Leaf gall, being a worm-like inrolling of the edge toward the 

 under side, quite variable in size. Found empty in midsummer, 

 and hence assumed to be caused by S. lanigera, which, as Miss 

 Patch has found, differs from S. americana in migrating to the 

 apple after the spring brood has formed galls on the elm. 



Fig. 32. Celtis occidentalis affected by a mite Eriophyes sp. 



Phvtoptus sp. with fungus Sphaerotheca phytoptophila Kell et al. Kan. 

 Ag. Exp. Sta. Rep. 1888:302. 

 Cook, Ins. Galls Ind. 862. 



"Witch-broom" gall, evident as a multiplication of twigs 

 from a single source, accompanied by profusion of buds which 

 often telescope and abort, giving base of tuft a scaly appearance. 

 Confined mainly to smaller branches, less than yi in. diameter. 

 Common. The fungus which formerly shared blame with the 

 insect is now thought by many to be merely a secondary and 

 incidental affair, the real culprit being the mite. 



